![Butterflied Lover](https://i0.wp.com/tvshowfaqs.com/wp-content/uploads/2024/05/36gGeMv7am6olsZcjC5AW8a6ter.jpg?resize=185%2C278&ssl=1)
With graduation 10 days away, homeroom teacher Hiiragi gathered all 29 students of class 3-A and proclaims them his hostages. His last lesson regards the death of a student that passed away a few months before. Nobody will be able to graduate until the truth is known.